Hi there joe,my son got the bike off his cousin,he rode the bike for about 2 months,then he had a punture in it and never done it he put it in the shed and that was it..all he done was ride it down to his mates every night and that was it.as he's only 9 at the time.he never noticed the bent back end.i now he could have not bent it as he rode it like a proper bike,iv cheeked it for stress marks on the bend and on the spray and its sound.so it looks like it was welded up wrong..regards paul